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Accurate Determination of Cavitand Binding Free Energies via Unrestrained Advanced Sampling
journal contribution
posted on 2019-10-11, 14:43 authored by Anne C. Leonhard, Jonathan K. WhitmerCalculation
of binding free energies, which characterize the stability
and specificity of molecular interactions (e.g., drug formulations),
has been established as an important application of modern computational
chemistry. Though several methodologies currently exist within the
literature, there is always a need for improvements in speed and accuracy
that allow for efficient and accurate chemical screening. In this
paper we explore the application of an unrestrained advanced sampling
method, adaptive biasing force (ABF), to the calculation of standard
binding free energies for a set of molecular host–guest systems
for which the binding free energy is well-known: the cucurbit[7]uril-hosted
systems utilized in the HYDROPHOBE challenge [Assaf et al. J. Phys. Chem. B 2017, 121, 11144−11162]. We demonstrate that the use of the ABF
advanced sampling method yields values systematically closer to experiment,
with a lower uncertainty in the calculation, than thermodynamic integration
and restrained sampling techniques commonly used in the literature.
We hypothesize that this is due to the algorithm’s ability
to drive multiple binding and dissociation events through applied
bias forces. These results show the promise of unrestrained advanced
sampling methods along well-defined reaction coordinates to the calculation
of binding energies in host–guest systems.
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sampling techniquesresults showsampling method yields valuessampling methodsdissociation eventssampling methodCavitand Binding Free Energiesbias forcesAccurate Determinationadaptive biasing forceUnrestrained Advanced Sampling Calculationhostbinding energiesHYDROPHOBE challengecalculationapplicationreaction coordinatesABFchemical screening
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